7.8=x^2/2-2x

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Solution for 7.8=x^2/2-2x equation: 


x in (-oo:+oo)

7.8 = (x^2)/2-(2*x) // - (x^2)/2-(2*x)

2*x-((x^2)/2)+7.8 = 0

2*x-1/2*x^2+7.8 = 0

DELTA = 2^2-(-1/2*4*7.8)

DELTA = 19.6

DELTA > 0

x = (19.6^(1/2)-2)/(-1/2*2) or x = (-19.6^(1/2)-2)/(-1/2*2)

x = 2-19.6^(1/2) or x = 19.6^(1/2)+2

x in { 2-19.6^(1/2), 19.6^(1/2)+2 }

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